Very few of the archaeological sites involving mammoths demonstrate human associationwith mastodons. This taphonomic analysis of several late Pleistocene mastodon skeletons provides compelling evidence of mastodon butchery. Butchery practices involved the production and use of tools fashioned from bones of the animal being butchered. Evidence for butchery and bone tool use includes the following: patterns of bone distribution and disarticulation recorded from a primary depositional context, disarticulation marks and cutmarks on bones, green bone fracturing, use wear and impact features on those fragments, and burned bone. The seasonality of death of butchered mastodons suggests that butchery was associated with hunting and killing, not simply scavenging of natural deaths. These findings provide new evidence of a well developed bone technology used by Paleo-Indians in eastern North America. -- AATA